<br><div><section class="_135editor" data-role="paragraph" style="font-size: medium; max-inline-size: 100%; margin: 0px; padding: 0px; border: 0px none; z-index: 0; overflow-wrap: break-word !important; outline: none 0px !important;"><p style="max-inline-size: 100%; margin-bottom: 0px; clear: both; min-height: 1em; cursor: text; line-height: 1.75em; overflow-wrap: break-word !important; outline: none 0px !important;"><span style="max-inline-size: 100%; margin: 0px; padding: 0px; cursor: text; font-size: 15px; overflow-wrap: break-word !important; outline: none 0px !important;">　　棉花从开始吐絮到吐絮结束大约需６５天的时间。进入吐絮期，虽然单位面积的总铃数已成定局，但中上部棉铃仍在发育和充实，铃重和衣分还远远没有定局，所以，田间管理仍不能忽视。</span></p><p style="max-inline-size: 100%; margin-bottom: 0px; clear: both; min-height: 1em; cursor: text; overflow-wrap: break-word !important; outline: none 0px !important;"><br style="max-inline-size: 100%; margin: 0px; padding: 0px; overflow-wrap: break-word !important; outline: none 0px !important;"></p><p style="max-inline-size: 100%; margin-bottom: 0px; clear: both; min-height: 1em; cursor: text; line-height: 1.75em; overflow-wrap: break-word !important; outline: none 0px !important;"><span style="max-inline-size: 100%; margin: 0px; padding: 0px; cursor: text; font-size: 15px; overflow-wrap: break-word !important; outline: none 0px !important;">　　棉花进入吐絮期，营养生长渐趋衰退，叶片由深绿色开始褪淡为黄绿色。健壮棉株上部果枝伸展较平，具有２～３个果节。下部果枝开始吐絮时，全株尚有１０个左右的蕾，上部果枝仍能每隔３天左右开一朵花，即所谓“下面开白花（吐絮），上面开黄花”。进入吐絮期的时候，叶面积系数已降为２.５～３.０，以后继续下降。成长中的棉铃颜色青绿，成熟棉铃壳薄吐絮.。如果上部果枝长的很长，向上伸举，赘芽多，叶色深绿，成长中的棉铃颜色发白，成熟棉铃吐絮慢而不.，这是营养生长过旺、贪青晚熟的表现。如果上部果枝短而细小，果枝伸展不出，且蕾铃脱落严重，铃小叶黄，则是长势不足而造成的早衰现象。贪青晚熟或早衰的棉花都不能获得高产，要靠加强花铃期和吐絮期的田间管理改变这两种情况。</span></p><p style="max-inline-size: 100%; margin-bottom: 0px; clear: both; min-height: 1em; cursor: text; overflow-wrap: break-word !important; outline: none 0px !important;"><br style="max-inline-size: 100%; margin: 0px; padding: 0px; overflow-wrap: break-word !important; outline: none 0px !important;"></p></section><section class="_135editor" data-role="paragraph" id="autoparagraph" style="font-size: medium; max-inline-size: 100%; margin: 0px; padding: 0px; border: 0px none; z-index: 0; overflow-wrap: break-word !important; outline: none 0px !important;"><p style="max-inline-size: 100%; margin-bottom: 0px; clear: both; min-height: 1em; cursor: text; overflow-wrap: break-word !important; outline: none 0px !important;"><br style="max-inline-size: 100%; margin: 0px; padding: 0px; font-family: 微软雅黑, &quot;Microsoft YaHei&quot;, sans-serif; font-size: 17px; caret-color: rgb(255, 0, 0); overflow-wrap: break-word !important; outline: none 0px !important;"></p></section></div>